We (mustn't/don't have to) waste water, because water availability is a really big problem.
mustn't
People (must/don't have to/should) volunteer for cleanups in their community, but they are very important and they should give it a chance!
don't have to
We (must/shouldn't/mustn't) be careful when using plastic bottles and bags - reusing them is the best way to help our surface water sources!
must
We (don't have to/has to/must) be careful with food waste, because it can produce greenhouse gases, and because food scarcity is very high in many countries.
must
According to specialists, car engines pollute the air with carbon dioxide, so we (should/must/has to) try to use other means of transportation, such as bikes.
should
We (shouldn't/should/must) encourage more people to plant trees in their communities!
should
The population (must/should) fight governments who support the idea of deforestation!
must
People in cities (must/should) practice recycling more in order to bring less trash to landfills!
should
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